Method of production of arsenate of lead.



UMTED STATES PATENT FELIX KAUFLER, O1 VIENNA, AUSTRIA-HUNGARY, AND AUGUST GEIW'EQLA, It MILAN, ITALY.

METHOD OF PRGD'J'CTION F ARSENATE 033 LEAD.

No Drawing.

clear, and exact description of the invention, such as will enable others skllled 1n the art to which it eppertains to make and use the same.

Arsenste of iced has heretofore been manufactured either by dissolving oxid of lead in arsenic acid or by a double decomposition of arsenates with lead salts. .The first named method has not yielded satisfactory results, because owing to the formw tion cf'lumps a catch part of the oxid of lead remains unattacked whereas the last named method has proved to he economically unfavorable.

The p 'esent invention is based upon the observation that the higher oxids of lead, when being reduced in the presence of an senic acid and water enter with the latter into reaction smoothly and without giving any waste products and yield as a result crsencte of lead. As n rednein' agent it is advantageous to employ arsenious acid whichis transformed into arsenic acid, this letter on its part being utilized for the for-- motion of the salt. By calculating the percentages of ersenious acid and arsenic scid Specification of Letters Eatent.

Application filed Key 20, 1312. Serial No. 698,583.

in the mixture of e-action, in nccoi'dzmce with the degree of oxidation of the lead (minium or dioXid of lead, as the case may be), more or less basic or acid erscnates of lead are obtained.

Example: kilograms of ersenious acid are oxidized in the known manner so as to form arsenic acid; the obtained acid solution is mixed with 200 kilograms of Water l5.5 kilogru1ns of a-rsenious acid and 100 kilograms of Inininin, and the whole niiiitnre is subjected to boiling. After the neutralination of the excess of said arsenete of lead of a nearly neutral 'resction is obtained.

We claim:

1. l rccess of melting; lea d arsenete, which fcomprises reacting upon a. higher czzid lead with arsenic acid and arsenious acid in the presence of Water.

2. Process of making leadersenate. which comprises reacting upon minium with sonic acid end ersenious acid in the presence of Water.

In testimony that we claim the foregoing as our invention, We have signed our names 4 in presence of two subscribing witnesses.

FELIX KAUFLER. AUG-U 3T C'HVTALA.

Witnesses for Felix lficufier:

Jose? RIcHAnn, ADA llsnin BERGER; Witnesses to: August Qhwale:

R. CARLO SAL IoTU,, ,P. P. on FnAMnns.

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